The selectable options for the Kind of Room Usage menu and the corresponding Use of Surface selection you must make to access them is found under Administration > Master Data > Catalog Management > Kind of Room Usage.

Kind of Room Usage Options and the Corresponding Use of Surface Selections Shown in the Red Box

The options cannot be added or removed, but you can double-click them to change their Weighting value or their associated colour.

Editable Options for Kind of Room Usage Entries